Is HE 0436-4717 Anemic? A deep look at a bare Seyfert 1 galaxy

Abstract

A multi-epoch, multi-instrument analysis of the Seyfert 1 galaxy HE 0436-4717 is conducted using optical to X-ray data from XMM-Newton and Swift (including the BAT). Fitting of the UV-to-X-ray spectral energy distribution shows little evidence of extinction and the X-ray spectral analysis does not confirm previous reports of deep absorption edges from OVIII. HE 0436-4717 is a "bare" Seyfert with negligible line-of-sight absorption making it ideal to study the central X-ray emitting region. Three scenarios were considered to describe the X-ray data: partial covering absorption, blurred reflection, and soft Comptonization. All three interpretations describe the 0.5-10.0 keV spectra well. Extrapolating the models to 100 keV results in poorer fits for the the partial covering model. When also considering the rapid variability during one of the XMM-Newton observations, the blurred reflection model appears to describe all the observations in the most self-consistent manner. If adopted, the blurred reflection model requires a very low iron abundance in HE 0436-4717. We consider the possibilities that this is an artifact of the fitting process, but it appears possible that it is intrinsic to the object.

arXiv comment7 tables, 11 figures, 16 pages; accepted for publication in MNRAS 17 Feb. 2015

References in corpus (46)

• The Leiden/Argentine/Bonn (LAB) Survey of Galactic HI: Final data release of the combined LDS and IAR surveys with improved stray-radiation corrections
• The Origin of the Mass--Metallicity Relation: Insights from 53,000 Star-Forming Galaxies in the SDSS
• The Swift X-ray Telescope
• The European Photon Imaging Camera on XMM-Newton: The MOS Cameras
• The Swift Ultra-Violet/Optical Telescope
• Determining Central Black Hole Masses in Distant Active Galaxies and Quasars. II. Improved Optical and UV Scaling Relationships
• Photometric Calibration of the Swift Ultraviolet/Optical Telescope
• The XMM-Newton Optical/UV Monitor Telescope
• Intrinsic disc emission and the Soft X-ray Excess in AGN
• The 70 Month Swift-BAT All-Sky Hard X-Ray Survey
• X-ray reflected spectra from accretion disk models. III. A complete grid of ionized reflection calculations
• X-ray Spectral Variability and Rapid Variability of the Soft X-ray Spectrum Seyfert 1 Galaxies Ark 564 and Ton S180
• Relativistic X-ray Lines from the Inner Accretion Disks Around Black Holes
• Simultaneous X-ray/optical/UV snapshots of active galactic nuclei from XMM-Newton: spectral energy distributions for the reverberation mapped sample
• Broad emission lines for negatively spinning black holes
• The Ionized Gas and Nuclear Environment in NGC 3783. I. Time-Averaged 900 ks Chandra Grating Spectroscopy
• Active Galactic Nuclei with Candidate Intermediate-Mass Black Holes
• Suzaku observations of 'bare' active galactic nuclei
• The Simultaneous Optical-to-X-ray Spectral Energy Distribution of Soft X-ray Selected AGN observed by Swift
• Emission-line Diagnostics of Low Metallicity AGN
• Paper II: Calibration of the Swift ultraviolet/optical telescope
• Metallicities and Abundance Ratios from Quasar Broad Emission Lines
• The Palermo Swift-BAT hard X-ray catalogue III. Results after 54 months of sky survey
• Dwarf Seyfert 1 Nuclei and the Low-Mass End of the M-sigma Relation
• A combined Optical and X-ray Spectra Study for Type 1 AGN. III. Broadband SED Properties
• X-ray Absorption and Reflection in Active Galactic Nuclei
• Investigating the nature of narrow-line Seyfert 1 galaxies with high-energy spectral complexity
• Chemical Abundance Calibrations for the Narrow-Line-Region of Active Galaxies
• Driving extreme variability: The evolving corona and evidence for jet launching in Markarian 335
• A Suzaku survey of Fe K lines in Seyfert 1 AGN
• Optical--to--X-ray emission in low-absorption AGN: Results from the Swift-BAT 9 month catalogue
• Fe-K line probing of material around the AGN central engine with Suzaku
• Suzaku observations of Mrk 335: Confronting partial covering and relativistic reflection
• Iron line profiles in Suzaku spectra of bare Seyfert galaxies
• Mapping the inner regions of MCG-6-30-15 with XMM-Newton
• An XMM-Newton observation of Ark 120: the X-ray spectrum of a `bare' Seyfert 1 nucleus
• A blurred reflection interpretation for the intermediate flux state in Mrk 335
• On the efficiency of production of the Fe Kalpha emission line in neutral matter
• Variability and the X-ray/UV ratio of active galactic nuclei. II. Analysis of a low-redshift Swift sample
• Caught in the act: Measuring the changes in the corona that cause the extreme variability of 1H 0707-495
• An XMM-Newton view of the `bare' nucleus of Fairall 9
• Iron Line Spectroscopy of NGC4593 with XMM-Newton: Where is the Black Hole Accretion Disk?
• The hard X-ray perspective on the soft X-ray excess
• Spallation of Iron in Black Hole Accretion Flows
• The low-metallicity QSO HE 2158-0107: A massive galaxy growing by the accretion of nearly pristine gas from its environment?
• The broad-band X-ray spectrum of the Seyfert 1 galaxy, MCG+8-11-11

Cited by in corpus (5)

• How well can we measure supermassive black hole spin?
• Multi-epoch X-ray spectral analysis of the narrow-line Seyfert 1 galaxy Mrk 478
• Variable blurred reflection in the narrow-line Seyfert 1 galaxy Mrk 493
• Complex Optical/UV and X-ray Variability of the Seyfert 1 galaxy 1H 0419-577
• The NuSTAR view of the Seyfert Galaxy HE 0436-4717